Just to add to what everyone else said, my best advice, and what I am trying very hard to do is this:
Get away from black and white thinking. Don't do things because you are no longer a witness. Do them or don't do them based on a good reason. Learn to think for yourself. There is nothing wrong with tattoos, piercings, wild hair, whatever, but that doesn't mean you should or shouldn't choose those things. Choose based on your own newfound sense of independent thinking. If something will make you feel good, enrich your life, and won't hurt someone else, then by all means do it if you want.
I have two very close friends who faded years before me, and one of our favorite sayings is, "Oh well, I'm going to hell anyway!"
We only say that as a joke, because we know witnesses look at us as though we are going to die. In reality, we go out and have a good time, but we keep it within reason, we pick a sober driver, and we don't even consider cheating on our wives because we know that just because we are not a witness doesn't mean that anything goes. In my opinion, that's thinking that the watchtower promotes: Anyone who is not an active witness is leading a degenerate lifestyle.
The best revenge is living well.